5.10. Geometry strings

A geometry string is a standard way of describing the size and location of a top-level window on a desktop.

A geometry string has this general form:

    'wxh±x±y'

where:

The w and h parts give the window width and height in pixels. They are separated by the character 'x'.
If the next part has the form +x, it specifies that the left side of the window should be x pixels from the left side of the desktop. If it has the form -x, the right side of the window is x pixels from the right side of the desktop.
If the next part has the form +y, it specifies that the top of the window should be y pixels below the top of the desktop. If it has the form -y, the bottom of the window will be y pixels above the bottom edge of the desktop.

For example, a window created with geometry='120x50-0+20' would be 120 pixels wide by 50 pixels high, and its top right corner will be along the right edge of the desktop and 20 pixels below the top edge.

Tkinter 8.5 reference: a GUI for Python

5.10. Geometry strings